覆盖Swing中的MouseWheelListener

Question

我想在Swing中覆盖鼠标滚轮监听器,但只有在按下控制按钮的情况下.监听器将附加到JPanel,这样当它们滚动滚轮时,它将滚动JScrollPane,当它们按下控制按钮并滚动滚轮时,它将放大.在我覆盖它之前,JScrollPane的默认滚动(显然)工作和我自己的听众 这是我的代码:

mainPanel.addMouseWheelListener(new MouseWheelListener(){
    @Override
    public void mouseWheelMoved(MouseWheelEvent e) {
        if ((e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK) {
            int notches = e.getWheelRotation();

            if (notches < 0) {
                redrawOnZoom(true);
            } else {
                redrawOnZoom(false);
            }
        }
    }
});

有没有办法说"如果鼠标自己滚动然后执行默认的JScrollPane滚动行为,但如果按下Ctrl然后缩放"？

Answer 1

如果您不想处理它,可以将事件分派给它的父代:

final MouseWheelListener wheel = new MouseWheelListener() {

    @Override
    public void mouseWheelMoved(MouseWheelEvent e) {
        // handle some events here and dispatch others
        if (shouldHandleHere(e)) {
            LOG.info("do-my-own-stuff");
        } else {
            LOG.info("dispatch-to-parent");
            e.getComponent().getParent().dispatchEvent(e);
        } 
    }

    public boolean shouldHandleHere(MouseWheelEvent e) {
        return (e.getModifiersEx() & InputEvent.CTRL_DOWN_MASK) != 0;
    }
};